fix add_library call with INTERFACE
diff --git a/CMakeLists.txt b/CMakeLists.txt
index ee5e7bc..ba59bb7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,7 @@
 
 if (DEFINED CMAKE_VERSION AND CMAKE_VERSION VERSION_GREATER_EQUAL 3.0.2)
 	include(GNUInstallDirs)
-	add_library(${PROJECT_NAME} INTERFACE ${headers})
+	add_library(${PROJECT_NAME} INTERFACE)
 	add_library(${PROJECT_NAME}::${PROJECT_NAME} ALIAS ${PROJECT_NAME})
 	
 	target_include_directories(